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• W2073753516 abstract "Alpha-1-protease inhibitor (alpha(1)-PI) and secretory leukocyte protease inhibitor (SLPI) are two natural airway serine protease inhibitors. While inhibition of neutrophil elastase is a function common to both alpha(1)-PI and SLPI, we showed previously that they exhibit different patterns of protection against antigen-induced changes in airway function in allergic sheep. Specifically, the protective effect seen with SLPI was similar to the profile of action of synthetic tryptase inhibitors in the model. Based on these data, and the fact that tryptase is a serine protease, we hypothesized that SLPI, but not alpha(1)-PI, would block tryptase-induced bronchoconstriction. To test this, we compared the responses to inhaled tryptase in five sheep without treatment or after treatment with either aerosol alpha(1)-PI (10 mg) or aerosol SLPI (50 mg). The doses of alpha(1)-PI and SLPI selected had been shown to be effective in previous antigen-provocation studies. Treatments were given 30 min before aerosol challenge with tryptase (500 ng). Tryptase alone increased (mean+/-SEM) pulmonary resistance (R(L)) 142 +/- 24% over baseline. Pretreatment with alpha(1)-PI had no effect on the tryptase response (R(L)increased 122 +/- 20%). Pretreatment with SLPI, however, blocked the tryptase-induced response (R(L) increased only 40 +/- 4% P<0.05 vs. tryptase). These are the first studies comparing the inhibitory activity of SLPI and alpha(1)-PI on inhaled tryptase-induced bronchoconstriction. We conclude that, in vivo, SLPI, but not alpha(1)-PI, can block tryptase-induced bronchoconstriction and that this activity may explain the differential effects of these two serine protease inhibitors on antigen-induced airway responses in allergic sheep." @default.
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• W2073753516 date "2001-03-01" @default.
• W2073753516 modified "2023-10-12" @default.
• W2073753516 title "Secretory Leukocyte Protease Inhibitor, but not Alpha-1 Protease Inhibitor, Blocks Tryptase-induced Bronchoconstriction" @default.
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• W2073753516 doi "https://doi.org/10.1006/pupt.2000.0276" @default.
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